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A piece of rough diamond which has the typical non-transparent skin. This rough diamond is easily clarity graded since the skin is completely transparent. Commonly called a glassie. Color can be just as deceptive as clarity in grading.Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.Even in a glassie, color may end up two to three grades lower after finishing.olor can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.
Diamond has many unequaled qualities and is very unique among minerals. It is the hardest known substance, it is the greatest conductor of heat, it has the highest melting point of any substance (7362Â° F or 4090Â° C), and it has the highest refractive index of any natural mineral.ISTINGUISHING SIMILAR MINERALS. The only mineral that can possibly be be confused with Diamond is waterworn Quartz pebbles which may resemble waterworn Diamonds, but the hardness and luster of Diamond will easily differentiate the two.